Android平台下VR头显如何低延迟播放4K以上超高分辨率RTSP|RTMP流

/*
 * SmartPlayerAndroidMono.cs
 * Author: daniusdk.com
 * Created on 2018/05/10.
 */
public void Play()
{
    if (is_running)
    {
        Debug.Log("已经在播放。。");   
        return;
    }
    //获取输入框的url
    string url = input_url_.text.Trim();
    OpenPlayer();
    if ( player_handle_ == 0 )
        return;
    NT_U3D_Set_Game_Object(player_handle_, game_object_);
    /* ++ 播放前参数配置可加在此处 ++ */
    int is_using_tcp = 0;        //TCP/UDP模式设置
    NT_U3D_SetRTSPTcpMode(player_handle_, is_using_tcp);
    int is_report = 0;
    int report_interval = 1;
    NT_U3D_SetReportDownloadSpeed(player_handle_, is_report, report_interval);  //下载速度回调
    NT_U3D_SetBuffer(player_handle_, play_buffer_time_);                        //设置buffer time
    NT_U3D_SetPlayerLowLatencyMode(player_handle_, is_low_latency_ ? 1 : 0);    //设置是否启用低延迟模式
    NT_U3D_SetMute(player_handle_, is_mute_ ? 1 : 0);                           //是否启动播放的时候静音
    NT_U3D_SetAudioVolume(player_handle_, cur_audio_volume_);                   //设置播放音量
    NT_U3D_SetVideoDecoderMode(player_handle_, is_hw_decode_ ? 1 : 0);          //设置H.264软硬解模式
    NT_U3D_SetVideoHevcDecoderMode(player_handle_, is_hw_decode_ ? 1 : 0);          //设置H.265软硬解模式
    int is_output = 1;
    int disable_use_image_planes = 0;
    bool is_supports_texture_format = SystemInfo.SupportsTextureFormat(TextureFormat.RG16);
    Debug.Log("is_supports_texture_format: " + is_supports_texture_format);
    int is_supported_multiple_format = is_supports_texture_format? 1:0;
    int max_images = 3;
    int buffer_pool_max_size = 0;
    NT_U3D_SetImageReaderOutput(player_handle_, is_output, disable_use_image_planes, is_supported_multiple_format, max_images, buffer_pool_max_size);  //硬解码image reader
    int is_fast_startup = 1;
    NT_U3D_SetFastStartup(player_handle_, is_fast_startup);                     //设置快速启动模式
    int rtsp_timeout = 10;
    NT_U3D_SetRTSPTimeout(player_handle_, rtsp_timeout);                        //设置RTSP超时时间
    int is_auto_switch_tcp_udp = 1;
    NT_U3D_SetRTSPAutoSwitchTcpUdp(player_handle_, is_auto_switch_tcp_udp);    //设置TCP/UDP模式自动切换
    int is_audiotrack = 1;
    NT_U3D_SetAudioOutputType(player_handle_, is_audiotrack);                   //设置音频输出模式: if 0: 自动选择; if with 1: audiotrack模式
    NT_U3D_SetUrl(player_handle_, videoUrl);
    /* -- 播放前参数配置可加在此处 -- */
    int flag = NT_U3D_StartPlay(player_handle_);
    if (flag  == DANIULIVE_RETURN_OK)
    {
        is_need_get_frame_ = true;
        Debug.Log("播放成功");
    }
    else
    {
        is_need_get_frame_ = false;
        Debug.LogError("播放失败");
    }
    is_running = true;  
}

private void OpenPlayer()
{
    if ( java_obj_cur_activity_ == null )
    {
        Debug.LogError("getApplicationContext is null");
        return;
    }
    player_handle_ = NT_U3D_Open();
    if (player_handle_ != 0)
        Debug.Log("open success");
    else
        Debug.LogError("open fail");
}

private void ClosePlayer()
{
    is_need_get_frame_ = false;
    is_need_init_texture_ = false;
    int flag = NT_U3D_StopPlay(player_handle_);
    if (flag == DANIULIVE_RETURN_OK)
    {
        Debug.Log("停止成功");
    }
    else
    {
        Debug.LogError("停止失败");
    }
    flag = NT_U3D_Close(player_handle_);
    if (flag == DANIULIVE_RETURN_OK)
    {
        Debug.Log("关闭成功");
    }
    else
    {
        Debug.LogError("关闭失败");
    }
    player_handle_ = 0;
    NT_U3D_UnInit();
    is_running = false;
    video_format_ = VideoFrame.FORMAT_UNKNOWN;
    video_width_ = 0;
    video_height_ = 0;
}